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<!DOCTYPE html> <html> <body> <h1>What Can JavaScript Do?</h1> <p id="demo">JavaScript can change the style of an HTML element.</p> <button type="button" onclick="myFunction()">Click Me!</button> <script> function myFunction() { var x = document.getElementById("demo"); x.style.fontSize = "25px"; x.style.color = "red"; } </script> </body> </html>